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參數資料
| 型號： | L84225 |
| 英文描述： | L84225 100BaseTX/FX/10BaseT Physical Layer Device technical manual 4/02 |
| 中文描述： | L84225 100BaseTX/FX/10BaseT物理層設備的技術手冊，4月2日 |
| 文件頁數： | 28/118頁 |
| 文件大小： | 890K |
| 代理商： | L84225 |
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28 of 118
April, 2002
L84225 Quad 100BaseTX/FX/10BaseT Phys. Layer Device - Technical Manual
Copyright 1999-2002 by LSI Logic Corporation. All rights reserved.
2.7.2 10 Mbps
A descrambler is not used in 10 Mbps mode.
2.7.3 Descrambler Bypass
The descrambler can be bypassed by setting the bypass
scrambler/descrambler bit in the MI serial port Channel Configuration
register. When this bit is set, the data bypasses the descrambler and
goes directly from the TP receiver to the 4B5B decoder.
2.8 Twisted Pair Transmitter
2.8.1 100 Mbps
The TP transmitter consists of an MLT3 encoder, waveform generator,
and line driver.
The MLT3 encoder converts the NRZI data from the scrambler into a
three level code required by IEEE 802.3. MLT3 coding uses three levels
and converts 1's to transitions between the three levels, and converts 0's
to no transitions or changes in level.
The purpose of the waveform generator is to shape the transmit output
pulse. The waveform generator takes the MLT3 three level encoded
waveform and uses an array of switched current sources to control the
shape of the twisted pair output signal in order to meet IEEE 802.3
requirements. The output of the switched current sources then goes
through a low pass filter in order to "smooth" the output and remove any
high frequency components. In this way, the waveform generator pre-
shapes the output waveform transmitted onto the twisted pair cable to
meet the pulse template requirements outlined in IEEE 802.3. The
waveform generator eliminates the need for any external filters on the TP
transmit output. The line driver converts the shaped and smoothed
waveform to a current output that can drive 100 meters of category 5
unshielded twisted pair cable or 150 ohm shielded twisted pair cable.
2.8.2 10 Mbps
The TP transmitter operation in 10 Mbps mode is much different from the
100 Mbps transmitter. Even so, the transmitter still consists of a
waveform generator and line driver.
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